.box3{
    width: 60%;
    height: 700px;
    margin: auto;
}
.box31,.box32{
    width: 100%;
    height: 350px;
    margin: auto;
    display: flex;
    justify-content: space-between;
}
.box311,.box312,.box313,.box321,.box322,.box323{
    width: 25%;
    height: 350px;
    display: flex;
    text-align: center;
    flex-direction: column;
}
h4{
    color: #232323;
    font-size: 23px;
    font-family: "黑体";
}
h3{
    color: #555555;
    font-size: 13px;
    font-family: "微软雅黑";
}